Render appearing black and white cycles, how to fix?
In the UV/Image editor, you are looking at the blue channel only, individual color channels get displayed in black and white
Switch to RGBA or RGB view.


From the Manual

Draw Channels
The radio buttons set which channels of the image are displayed.
RGBA
Replaces transparent pixels with background checkerboard, denoting the alpha channel.
RGB
Draw the colored image, without alpha channel.
Alpha
Displays the Alpha channel a gray-scale image. White areas are opaque, black areas have an alpha of 0.
Z-Buffer
Display the depth from the camera, from Clip Start to Clip End, as specified in the Camera settings.
Red, Green, Blue
Single Color Channel visualized as a gray-scale image.